http mvc:当路由不匹配时，我们可以设置asp.net状态码吗

public ActionResult NotFound()
{
    return new HttpStatusCodeResult(HttpStatusCode.NotFound);
}

public class NotFoundFilter : IExceptionFilter
{
    public void OnException(ExceptionContext filterContext)
    {
        if (filterContext.Exception is HttpException)
        {
            var httpException = (HttpException)filterContext.Exception;
            if (httpException.GetHttpCode() == (int)HttpStatusCode.NotFound)
            {
                filterContext.HttpContext.Response.StatusCode = (int)HttpStatusCode.NotFound;
                filterContext.ExceptionHandled = true;
            }
        }
    }
}

public class MvcApplication : System.Web.HttpApplication
{
    protected void Application_Start()
    {
        // 注册过滤器
        GlobalFilters.Filters.Add(new NotFoundFilter());
        // 其他初始化代码
    }
}